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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd216e993810dbf1402ffed5ecb1451cf192e7c51fc664accc54a508de846da63' 
  AND token = 'zxfx8kaXEZS8F1lSwT10Y1Ke2U5vcSlzWzFYouLuyOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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