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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9e9f1ce233d6a2d440d90fa18ba851062af584e735eeb66efd61961fe65ef7' 
  AND token = 'Kj7MifTb3ADGw7rgbJdGxKx38jyM5e7NPcVwW6t7tu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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