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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b420769a8d95fbcad17c4d751e36fde89039d001fe7ff2c666a1e48f8f0ed4' 
  AND token = '6+vpHLopi44n5Ta/L9DO1hMUFi5LcSClIiHkJYlesvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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