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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8767f17a24b160d8721619b4656aef929ff7115abf8436a8cd641eac2d51c0' 
  AND token = 'NxfZ9oW+dtFroatJQ9PeYHjSShRp6XHOc8EbVg70gd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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