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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe04f02b6edd66566b88dd6ea3b90e67f04b8abc434af9949316d80dd9be8bd5' 
  AND token = 'iVFcf9b8qQE6UzFnX7taEYAxYDO6aj3ccuPB9twenAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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