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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea6023b7cbe9a20090bad9deba154269adb15cddb92a7439187ac1ffa5c40e6' 
  AND token = '5g8XhD0+dNp+lMBPgsQAdEfJU9ZBcZTGcML2FiwlWUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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