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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f019c871448c587ede87b00208bd558d7138301af63824ffe333e2c21ede1c' 
  AND token = 'NkMWEleBzOvACDcRyHoa9eWIe2kfw8WDEe/9C4ezIaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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