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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e215befea41c2f0cfa87deb7e5c5a51e1efc282634a69677b83de31a4bf553' 
  AND token = 'YuHFFh5amW5GxIL6epcbQbo2FSBbJrREys0ph+OiiEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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