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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd69f00860b933ff3552fb0145d565bc819249b517f9d553de3535eea7d208b' 
  AND token = 'Bqf/EYHNS4s6ql4v/TFtTFdw//4QI7VdinUV+MSZUlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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