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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd886e7b2bd36e64fe297b3286de33312ae3bdc5778e8292456c3b47080a1bf11' 
  AND token = 'ddo0acWKWpQcXqC2mrUGjM7hVMT5mj406eM0KOGaPjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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