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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63eb999e7c4650459b3094cd371d696ec31e8803809dc2b7593f4a238bfe851' 
  AND token = 'PBRM95Z06jTM7K++SysWbkyAnPlx0cBO8v3Pae8pLXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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