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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ad0ae6d74aa03bd651f8db242dd5e9d41b3d998a6b5494a119aeea47e56c5b' 
  AND token = 'bJOypxtbGmDbfvqvWp9BouB6Nb8rTBbVj7P/isWL+ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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