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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72dc40efa2b0d814b01514341399c80e13c9fa83b149691fe418095c315ce49f' 
  AND token = 'PByBRkMUNrmwd31z9BByJBe2km2Yj12/qpsnUdX+W3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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