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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6284b27ab4284dbded2137e7fddb8ba0ca48fec5dff8af76c8bc549f558c8992' 
  AND token = 'F6MamxYSb/an4FetPG/5hfN5Mo4MpwCXQ6wJZU2cfMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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