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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38885ef1a0280a239f9a93c7446285ec96d0e291cd57c47c197a84184c5026f6' 
  AND token = 'O59J4frEaQ0wrECTGub5n2U8CkxY+/OgDdauXq0JwYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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