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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8364033ba0ca696c1ca881a254e011a02ee401d302679d05dd0eba03af6ca69' 
  AND token = 'I7kifuHXLX2ldjzleizQFMZvhSj71v9BNseTQSzA1wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01747

JSON explain

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