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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29011fb55a4aeb7dddf78580cd9c828246a011da9f0a5f9f368e7683a7c696c3' 
  AND token = 'JL7zb2cXteGQNdfXCYg5FuGLtsLvLxqQeS6J6WPbQmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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