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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3b9c736d560ae3dc0a8d7b4a51bdc4ebdc79e0cccde942aefb0c8880df7694' 
  AND token = 'gLgoZ4IKnHH+n6YyR5V8kSl68ac2XrJHO1p9aXMAZQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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