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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ecebaa294b7b79e30895a1d7f7ff98b4d0064c805b336208e3c0f421e84a4ab' 
  AND token = 'kUP2HJfmpVMiYGcDZgFUd6gvkvRizogA4v93AkFz3aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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