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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdd1e50f02ffaa211bc1910fa84e31b0998d13e33473a41bf00195316797ab6' 
  AND token = '1WQD3KuSY/3YzaMZDjrgILRzIuTlnXLqyaKX1PMvKmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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