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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319403086cd13bef190a7fd1fd0b9aa23d51503a21ecfee8f623459a589c4981' 
  AND token = 'iFL+kJnED1PjxdNXQWAxrhgHP3ACUkyB0WqzuGY+A9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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