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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f85c232e368c7075db890e82a98826460927a127b53476833a92fb108b86f7' 
  AND token = 'owUUbNxP4glyE+B8+LZHsUactRvtxGUAJZNAvWMibhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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