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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9041af4299e9ef209092bd81944eb861b260ca6aac45dd902a1afb6c39d7b345' 
  AND token = 'SZxS62fpuOAxb2R4quDV1rDQqT/NzH9+w8hjZGMxPyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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