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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3eb510a0df9092841cc25d13d4f1ba88b85abd4d1ec3ca3420e56b45ae8fd8a' 
  AND token = 'iTvG/Z7z9l7LcXwbJJc9d8ZcUzCtQgE1OIoCOz5ALE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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