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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dee9f64eae06448d7d511725f4ff7eadbf97d7ebf7b86bbebd43e83cc867f1' 
  AND token = 'oh+XSPcoi4seeu6m8R47qPo57su+xKM4oCM/S6uWQdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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