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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32168487381c1e8cd3eb910925b476a4af5b1b5edadb133cb22a2476468bb9dd' 
  AND token = 'uyEq8dq+Hnadvmgww2xKJ4OOartaMOg2/LpUfub4spU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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