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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab09b959668aa513a3bdcf611fca1bbb695c6c3fc527c9d23d7ccf94d54a2ba' 
  AND token = 'D0TXhEN6lSEFOvRXxsv+Tb5N/S2CcPL5qjE3p8Jf1uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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