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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a8d83912490c8c7143d0fc04542110b0f8a542cc8f0e39fd24c0e86088482d' 
  AND token = 'Fw01vgZbfiTcD7LENHvsBrKOjjXkQ+TdJ869LajNNrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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