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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed5a29ead3af9a3d6ce1ab06853d37edbe0eaa84c2f9a2b8c015dfe40251cd1' 
  AND token = 'M86wI6WKgfclg/SW50bPByyZW68PW/hLBdWsHpF0yCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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