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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa285d8b8468d3f770401b7aaa6573209accca8077b509f96c32b3097e10730' 
  AND token = 'p4vNbjVRoZom+MOQ+qkp3/QT7XmA8/cH/OylgmyHC6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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