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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b6c077db2eaa0ecbe1da37283f5619d67879dfc35aa9b4df23ed6b774f27b9' 
  AND token = 'jkpPzIciIa00nnvNew6YWD/v/S4SWCPV7zfRgdvw1mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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