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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dc11666c4738c4cb4838f1d9b5051a67994b27055136a0e264e190eb28a23c' 
  AND token = '8tDQFsyJSDp0ZfJjs0n7yJkdmxdtkVjf9IVc9iOazQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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