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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbeb90a09c493ea47c1ea189c72d0f94093ed44d698ee6b3cf19ab0ff329763' 
  AND token = 'tSbEwhNMGgfTZ3qkwlSgNNN0PDh7OH+05ul+EfnpMQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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