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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e595bd4a23c21a5588a1d796d932ce2d84b56b83e402eb845db6647b13660f' 
  AND token = 'cxMX+6hLCgxjvbGXvOEg2/v4ilCnoo4qCAU534oha7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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