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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0dd19f61755950baa0889e36eb871a864c6def1b258927ccc00f9c6bbe8f00' 
  AND token = 'xzb8X3JScPTZOjgiMI208r4oD6AJItTfXbAPCiDvNqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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