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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618f802cabc305edf6ae2af65daadbb9ef9a5addcbc644066825cb28ed419bf2' 
  AND token = 'oqKAI4ezaa2i7wql+CQ4gZjX+IGskh6szpo9Q6pJxHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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