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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4bbb7bcb9c41f5a7eac21db7d6dcb89557b756991ef899aedd6a7be6f31664' 
  AND token = 'DDYFR2X1Mdv6iOXSMtbr2o9h5eN4tg8Fi+yIlJKGJLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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