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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e8dbb469e651e75ce7312ac02d1fc0d2c7f12e5bbc551c423ab567ef61c881' 
  AND token = 'PlTll4XKcarlx/88ng4H8AseLToV4WImAU889RmUOQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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