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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f9223b15f73c0a39e7945eeee1cc3740ca7916313fef8c86fad8244f028411' 
  AND token = '1JwHiw1OXVe3fROTB/n61jN34cF+4WjSvye74rsjdvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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