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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0039881721b143bc69f443edc25f40194ba50d70b0fe1d732bcd0f37068ae92' 
  AND token = 'TBDYDpZOi8+wWO+aRs6tP9eomIkVF5hoecHZYfr49Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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