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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7684a13aa28fc99116d67155b1c10c50a636f3fca77307021ce143e59bb43196' 
  AND token = 'lKmUuEDFt237BwwtlglbfEdp0GwiNvm7Y3j8OBaEsJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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