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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82172b5c9588011ca410f341b858db6a8ea5ed594c79dafbd532d4b7e985860e' 
  AND token = '3RfmHRwc6MAkGDmiiVff9Ws+gFDooqjelA5hjb2KLqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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