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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56026fe92dfd1daf8347786734636676c404f39bb957b07f77d58f7c4ca0db3' 
  AND token = 'mWWuzbtyZ5sw0ZncfdIJAg0i62acHOV1D6Z5hlMN2po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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