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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af27a6c0dc6a4ceadd81702aae08d6c8ada46854268952a7cce7df1a9e39b32' 
  AND token = '/QS4JQfSzAID1ausIXsqiKb4T5iot9nEkKJfjrUEckg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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