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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34cd9e74615e610fa3f25a720e59a31e7e58d94d806417cf82d754ddca50b1b' 
  AND token = 'n5BfY3gzi4snZVP3Nsmn0inNoa21e4k2Lpvd9xufWdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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