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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccee6c9a98bf329b4ebcfdf8a51b270675aa2e786b6f3b1e3438c1ef2f1a24c9' 
  AND token = 'K9cbrjhyHgJZCySxkkO3hoPmfo6KbEtg9AEq5E1qDsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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