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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fc675a845061f6ebf3dc0e1cd3a41efa3059802bd654440d4ae7b2bf8537f2' 
  AND token = 'gIme9202mhR4bPr8SV4udnNbU1taEPpdfzss48qTUpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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