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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee335c656673251dc441d3fbafabcac096fa1401c58b4d8abae568d437661a1' 
  AND token = 'hgWMaZs6iG+gnwmJ32HatugdUeA/zLZpkXa4e1BdDj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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