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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73feab03798d0382a8af5e89e45f308fdf327b6319073435ea3525886346e826' 
  AND token = 'EUA8+rc4PbdzmQNYsmXDrwMA+5llN3HYnOsbolHHTu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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