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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c0442038135a2327df6c0ac4fe4564e4b9e9b02fc59bd2e58b99521d800f25' 
  AND token = 'y3x7AVTexSm9Aj4CbPFQMNQqFfXGGjIVjvrEtqsB0Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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