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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58336d0775e3d7050322f6ad03fa4e8a53ee71f3f861effb316e87f90225d08b' 
  AND token = 'p10UBsAsFE6b91pvk1l8WSpghObPfApsvNfjsQLxe/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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