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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9574b3aac1e708bb5c46af95975d20e2ee84730af95d2b1c977e848bb03ee43' 
  AND token = 'yxJzO0HQe0AmLWN2a6xpdQiXs3IfNyFcbEPKj85d/fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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