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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1700a3bbbacad9e143bd436bf3e97eee4d76d8581ff06b4832b4df8a9130aebe' 
  AND token = 'SwQz8t+oIY0hCrb1FF8il5qkn8NhYoIGij91048+Gjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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