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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1948ea019c3c7dcae4c449c6f4ff99d653b81caaac3baf08e7aca36c0ae0f3e4' 
  AND token = 'naek0bXJ4tRSnnx7iSuVO6q3uDl3FpM1TDtsTvmPTtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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