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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2df5b894b950ae5d18fcfb045836a4a447b023ade5a4db1231ba5bd2ac05aec' 
  AND token = 'Y8yVH2vlRm/lveVI3viEvMc9YECk87sCSk9ip/tzuO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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