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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd156ca73358100cc9b4be13cfcec54ca8e7188a190b8ddea534a154a69268c90' 
  AND token = 'Xlz+q4vCpUwyyGcLArVgRZzHNUBXefJZXwalPNrWkO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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