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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da2e9b2828f9a53a78c20f04a5f69877a63a213de8703e66ef9c0da29e027dc' 
  AND token = 'AyhqtPFLXkMUraziv1DCI7jlHpqhZh2HF6HxCDHIJB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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