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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0a0e1daf98ccbc85bd96e81024a6e12ecc295cab735eaeb3fa3e579b0cf64f' 
  AND token = 'XKH2Ho748fn99Y7VxkXD2OI9UoEXurEWBSX7Idb98ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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