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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2007e1d53c8143b2c8f8d7bd267a192197ccef8101268c3c6173f6a876064b3a' 
  AND token = 'dCo49tmwl0q5ym4Gx6zj9STCFdZAJTuPf/e00robTpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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