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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f00b7ac989a30035c30de2002b89c1ca3cc454c31595cb4c63278e67998c9a7' 
  AND token = 'B8AorUJYmhWP250Bldy5+ZhAopqxcWzB+v1Iozf52e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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