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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7e29d1820d2b81051631cc0fdd5ee58fdc00cbcb0ae951446540b24e2d5dfc' 
  AND token = 'oJ9jyYlHRKNkm/TPUt+IswpZBOqfbxyfrxN6yFM58mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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