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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7433b0f4400eca2a5d5bf43547ad6fbbdffb80d6b3d6c8d2bda4a21f3e16ddf6' 
  AND token = 'YCikke06nbvEo0R+6sZbCN9qLMf8sKLNNgo/i+zodHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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