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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3e9b2995ec36740473537c7829fdbcf9862b797576d3e614fcb9cddbefb5f5' 
  AND token = 'RWnDzNaEx8wQd9MdEDswAjyVYUxmfpK8P4dlgQWzP+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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