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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe7a9ef1c02ad54b441b827275ea31841c25632a7ba974994796fd108bda6eb' 
  AND token = '5xnsLNZuhsJAr3bK0e521NweN9h5ZkjmWfaDjaXAhhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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