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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79ed6fd79e7282ae0f9a1987b3fcc615212bfdf99816a19f7c0ea93a7e7f46a' 
  AND token = 'kcvHI+zGk58Q93ZvHlEbD3iGGr0thXYi0O36P0ZvY4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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