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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e2cf2878cd12437b03e58de639792d94c76b5eab30ec167e7662062f682d33' 
  AND token = 'LO/D6kFR5qBVGxGuNHpA5qBmoeA6Ur6Hjs8Lk6SER6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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