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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbe7009766cb2dbfe1c13238fe7333b8bd42a118c584c7b5e3e789a9f8e3676' 
  AND token = 'L3z3T6nIExJbQ0ejImdSwNwtiXEfgeCxV99bjuKguKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}