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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b23920483dec0e8eda5824db8ac56f6f531f1fde174ad84c13c869944e9e4d' 
  AND token = '9oIpZ3n500HNDgrewxc+1pXESAPSKju7PR5e80B09vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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