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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12256fd418e1d6d4432f227dd206ad7f511f298adfb13b7ae4d9c061d1055bb' 
  AND token = 'm62Zex0KgZavTLD6hJ9+nQrxPG1RZDyYfgWCvltZAYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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