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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5477e8135d4e17bfc23a373694599e48f6b8927bb1260327b46cc68102a1c2' 
  AND token = '5dJ5lH/efmNa0Xm830nDLD5rg99Y+WOkHbdK2sHAH1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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